Hydraulically operated piston pump



July 23, 193s. E. T. JDERBLOM 2,008,760

HYDRAULICALLY OPERATED PISTON PUMP Filed May 8, 1934 2 Sheets-Sheet 1July 23, 1935. E. T, JDERBLOM HYDRAULICALLY OPERATED PISTON PUMP FiledMay 8, 1934 2 Sheets-Sheet 2 Patented July 23, 1935 2,008,160HYDRAULICALLY oPERA'rEn Pis'roN PUMP Erik Ture Jderblom, Alnas, Bo,Sweden Application May 8, 1934, Serial No. 724,473 In Sweden July 1,1933 4 Claims.

The present invention relates to hydraulically 'operated piston pumps,especially adapted for great lifting heights, for instance for drawingup water from deep (bored) wells. In such plants a driving pump isarranged above ground and connected with the piston pump submerged inthe woll by two conduits or pipes which are alternately supplied with.liquid under pressure for driving the piston pump. Hydraulicallyoperatedl pumps of this kind are to have in the first place a smallhorizontal diameter in order to be capable of being submerged in a boredwell having a diameter of f. i. 100 millimeters, and are to be providedwith a regulating or setting device in order to adapt the piston strokeor the cycle of the driven pump to that of the driving pump.

The invention relates to a pump which complies with both said conditionsand, moreover, is of extremely simple structure, which is a, primarycondition for reliability in operation. The pump according to theinvention consists of a pump pumping fluid in each direction by means ofa pump piston which is attached to the middle of a hollow piston rodwhich carries at each cnd a driving piston operating in a drivingcylinder coaxial with the pump cylinder, each of the driving cylinderscommunicating with a raisingplpe.

Both ends of the piston rod, which forms for instance a tube, are valvecontrolled. The driving pistons are provided with outlet ports for theliquid to be pumped. Through the hollow piston rod both pipes maycommunicate with each other so that the fluid pressure be balanced. Innormal operation, however, one of the ends of the piston rod is checkedand the piston driven by the pressure fluid, whereby the pump piston,which is connected with the piston rod, is moved and sucks in, on one ofits sides, the fluid to be pumped, while it presses the liquid collectedon its other side by a preceding stroke into the pipe leading to thesurface.

The invention will be described more in detail with reference to thedrawings showing an embodiment of the invention. Figure 1 is a verticalsection taken through the pump cylinder, .showing the pump piston, thedriving pistons as well as the valves. Figure 2 is a section taken online 2-2 of Figure 1. Figure 3 shows the' control device for the valvebody. Figure 4 is a section taken on line 4;-4 of Figure l, showingsuction orifices. Figure 5 shows a driving pump connected with the wellpump.

The pump cylinder I is at is upper end connected with the raising-pipe 2and by means of its lower end with the raising-pipe 3, which pipes areconnected with the driving pump set 24, 25, Fig. 5. The pump cylinder issubmerged so as to be located entirely below the level of the liquid.The lattcr can enter the pump cylinder I through suction inlets 4, 5which are alternately closed and opened by spring-loaded ring valves 6and 1, respectively. At each end of the pump cyl-l inder a drivingcylinder 8 and 9, respectively is provided in which a driving piston I0and I I, respectively, reciprocates. The driving pistons areinterconnected by means of a piston rod I2 to which the pump piston ,I3is secured by means of a threaded joint or in other suitable manner. Thepiston rod I2 has the shape of a tube so that a connecting-duct I4 isformed between the driving cylinders. The driving pistons I0, II areprovided with outlets I5 and I6, respectively, through which the pumpcylinder communicates with the raising-pipes 2 and 3. Inside the ductI4, which according to the invention serves as a regulator duct, andcoaxially therewith is arranged a valve stem I 'I which is at each endprovided with a valve body I8 and I9, respec tively, controlled byvalve-guides 20 provided on the kdriving pistons. The outer ends of thedriving cylinders are provided with abutments 2|, 22 for the valvebodies, said abutments serving to open said valves against the action ofthe hydraulic pressure when the driving pistons run over their normalend positions.

In the drawing, the pump piston I3 is shown in a mid-position. Thesuction orifices 4, 5 are closed by means of the ring valves 6, 1. Thevalves I8, I9 are shown in open position whereby the pump cylinder cancommunicate through the ducts I5, I6 with the driving cylinders 8, 9which in turn communicate by the duct I4.

In the shown mid-position-the valves do not, however, normally occupythese positions but only in case the pistons of the driving pump sethave been checked in the corresponding midposition. If by means of thedriving pump set ya hydrostatic pressure is produced in the raising-pipe3, the valve body I8 is brought into shut-off position, and is thenpressed against the lower end of the driving piston I0, forming a valveseat, and acts as a piston head. Due to said pressure the driving pistonI0 is moved upwards together with the pump piston I3. In continuing theupward movement, the pump piston I3 produces a vacuum within the pumpcylinder on the underside of the pump piston, .so that liquid can enterthrough the suction oriices 4 since the ring valve 6 is opened by theaction of the outer hydraulic pressure. The liquid above the pump-piston is raised by the upward movement of the piston, while the ringvalve 'l is closed, and is forced through the ducts y I6 into theraising-pipe 2.

The piston stroke of the driving pump is determined in such a mannerthat the pump piston is normally stopped before it arrives at stops 23and 24, respectively, made for instance of rubber. Considering that, dueto leakage, thel position of the pump piston may change relative to thepiston or pistons of the driving pump, means hereinafter described areused for obtaining corresponding positions of said pistons.

The pump piston arrives in abnormal cases at its uppermost end positionin which it hits the stops 24 and 23, respectively, the valve body I9then being checked by a stirrup 22 and 2I respectively, or the like, sothat the valves I8, I9 are set in the mid-position shown in Figure 1, inwhich the ends of the duct I4 are open. Hence, liquid can pass freelyfrom one raising-pipe to the other, and the pressure in theraising-pipes is equalized before the start of the next working stroke.

In the continuation of the operation of the driving pump a hydrostaticpressure is produced in the other raising-pipe 2, so that the valve bodyI9 is pressed against its seat on the driving piston II, and the ductsI6 and I 4 are shut oi while the pump piston is moved into its lower endposition. Then liquid is sucked in through the suction orices and llsthe upper portion of the pump cylinder whereas the quantity of liquidpreviously sucked into the lower portion of the pump cylinder is forcedupwards through the raising-pipe 3.

Fig. 5 shows more diagrammatically the entire pump connection. The pumpI is connected by tubes 2, 3 with cylinders 24, 25 in which pistons 26,21 are reciprocated by means of rods 29, 30

suitably connected by a slide and pin 3I, 32 with a lever 28 which ispivotally casing 34.

'Ihe lever 28 may be driven by hand or by another suitable source ofpower not shown. By moving up and down the lever 28, fluid underpressure is pressed alternately into the pump 2 and 3, causing thereciprocation of the pistons I0, II and thereby of the pump piston I3.

I claim:-

1. In well pumping apparatus a pump cylinder, valve controlled inlets tosaid pump cylinder at opposite ends thereof, cylinders arranged at eachend of said pump cylinder coaxially thereto and communicating with it,uid conduits connected to the outer ends of said cylinders, pistonsreciprocating in said cylinders, and being provided with outlet portsfor the liquid to be pumped, a tubular piston rod connecting saidpistons, a pump-piston reciprocating in said pump cylinder and beingconnected with said piston rod, the ends of said piston rod beingcontrolled by valves adapted to be closed by iiuid pressure, saidtubular piston rod connecting in the open position of its valves saiduid conduits.

2. In well pumping apparatus as claimed in claim l, a single valve-bodycontrolling both the outlet ports in the piston and the coordinated endof the tubular piston rod.

3. In well pumping apparatus as claimed in claim 1, a single valve-bodycontrolling both the outlet ports in the piston and the coordinated endof the tubular piston rod, said bodies being connected by a rodtraversing the hollow of th piston rod.

4. In well pumping apparatus as claimed in claim 1, a single valve bodycontrolling both the outlet ports in the piston and the coordinated endof the tubular piston rod, said bodies being connected by a rodtraversing the hollow oi the piston rod, and abutments in said cylindersadapted to bring both valve bodies into an open position.

held at 33- in the ERIK TUBE JDERBLOM.

